<template>
    <div class="login_content">
        <div class="login_box">
            <!-- 头像区域 -->
            <!-- <div class="logo">
                <img src="../assets/logo.png" alt="">
            </div> -->
            <!-- 登录表单区域 -->
            <el-form class="login_from" ref="loginFormRef" :model="loginForm" :rules="rules" >
                <!--用户名 -->
                <el-form-item prop="username">
                    <el-input v-model="loginForm.username" prefix-icon="el-icon-user-solid"></el-input>
                </el-form-item>
                 <!--密码 -->
                <el-form-item prop="password">
                    <el-input v-model="loginForm.password" type='password' prefix-icon="el-icon-lock"></el-input>
                </el-form-item>
            </el-form>
            <!-- 按钮区域 -->
            <div class="button_box">
                  <el-button type="primary" @click="login">登录</el-button>
                  <el-button type="info" @click="resetLoginForm">重置</el-button>
            </div>
        </div>
    </div>
</template>

<script>

export default {
  data () {
    return {
      loginForm: {
        username: 'admin',
        password: '123456'
      },
      rules: {
        username: [
          { required: true, message: '请输入用户名', trigger: 'blur' },
          { min: 3, max: 10, message: '长度在 3 到 10 个字符', trigger: 'blur' }
        ],
        password: [
          { required: true, message: '请输入登录密码', trigger: 'blur' },
          { min: 6, max: 15, message: '长度在 6 到 15 个字符', trigger: 'blur' }
        ]
      }
    }
  },
  methods: {
    resetLoginForm () {
      this.$refs.loginFormRef.resetFields()
    },
    login () {
      this.$refs.loginFormRef.validate(async valid => {
        if (!valid) return
        const { data: res } = await this.$http.post('login', this.loginForm)
        if (res.meta.status !== 200) return this.$message({ message: '登录失败', type: 'error' })
        this.$message({ message: '登录成功', type: 'success' })
        // 1.将登录成功之后的token，保存到客户端的sessionStorage中
        //  1.1 项目中出了登录之外的其他API接口，必须在登录之后才能访问
        //  1.2 token只应在当前网站打开期间生效，所以将token保存在sessionStorage中
        window.sessionStorage.setItem('token', res.data.token)
        // 2.通过编程式导航跳转到后台主页，路由地址是/home
        this.$router.push('/home')
      })
    }
  }
}

</script>

<style scoped>
.login_content{
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100%;
    background-color: #2b4b6b;
}
.login_box{
    width: 550px;
    height: 350px;
    background-color: #fff;
    border-radius: 3px;
    position: relative;
    padding: 50px;
}
.logo{
    width: 150px;
    height: 150px;
    border-radius: 50%;
    overflow: hidden;
    position: absolute;
    top: -25%;
    left: 36%;
    border: 10px solid #fff;
    box-shadow: 0 0 10px #ddd;
}
.logo img{
    width: 100%;
    height: 100%;
    border-radius: 50%;
    background-color: #eee;
}
.login_from{
    display: flex;
    flex-direction: column;
    padding-top: 70px;
}
.button_box{
    display: flex;
    justify-content: flex-end;
}
</style>
